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Presets own the rows that decide what a session's `/` menu contains, but both browser catalogs cache per session and had no invalidation edge for a recompose: `commands/changed` is registry-wide and recomposing registers nothing, so the menu kept serving the composition the session no longer ran. The host stream now frames the logged `agent-preset/selected` commit as `host/session-preset-changed`; the runtime bridges it to the typed `session/preset-changed` event, `ui-command` soft-refreshes that session's directory key and `ui-skill` invalidates its catalog entry. Reaching the host on a second switch was a separate defect: the list-row identity guard compared every summary field except `agentPreset`, and the merge keeps the row's `updatedAt`, so a switched row looked unchanged and served its cached instance forever. The hero chip compares the pick against that row, so switching back to the creation-time preset sent no RPC at all.
host/ — web-GUI host half
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The host side of the dsh web GUI: the API gateway every client shape shares, and the plain HTTP server it rides on. The browser side lives in client/; the composed application is apps/cli booting the dsh-base bundle serving apps/web. All product packages.
| Package | Role | ctx key |
|---|---|---|
apiproxy/ |
Shared host API gateway and wire contract | ctx.apiProxy |
webserver/ |
HTTP route carrier | ctx.httpServer |
frontend-static/ |
SPA dist server on the webserver fallback seat | consumes ctx.httpServer |
directory-picker/ |
Workspace-directory picking seam | ctx.directoryPicker |
directory-picker-native/ |
Native directory-picker backend and browser interaction | registers ctx.directoryPicker |
directory-picker-browse/ |
In-app directory-browser backend and interaction | registers ctx.directoryPicker |
directory-picker-auto/ |
Host-adaptive picker composition | mounts a backend |
apiproxy remains transport-independent; client/connection supplies the browser/HTTP carrier. Picker implementations replace one another behind the shared seam.
The subsystem references: http-server.md and workspace.md (the picker seam).